Rev counter signal on MK2 Driver > ABF Conversion?

[Supercharged 2]

Helping a mate finish and tidy up an ABF engine transplanted into a late mk2 driver....

 

He is still using the original clocks and we are trying to find the wiring that feeds the rev counter, the original coil wire's are still there but most of these seem to terminate at an 'ignition amplifier' under the scuttle with only a black wire that doesn't - not seen an amplifier thing on a mk2 driver before?

 

Also where do you take the signal from on the ABF, the coil?

 

The engine seems to run fine but I did notice what I think is a hall sender plug (under the dizzy cap) can be unplugged and makes no difference to the engine???

 

Hopefully someone on here has done a similar conversion?

[flusted 0]

mk2s normally have a black/red wire that is the rev counter feed and its on the negative of the coil